It's hard to imagine what new ground can be broken in the "Exorcist" universe, which has spawned five movies and two William Peter Blatty novels. But creator Jeremy Slater, who penned last year's solid horror movie "The Lazarus Effect," is giving it a shot anyway with a TV series version of "The Exorcist" (9 p.m. Fridays on Fox). While there's no sign after one episode of what that new ground will be, the pilot itself is enjoyable for what it is.